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The Last of Us Part I: The Last of Us Part I 100% Completion Guide

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Left Behind: Back in a Flash and Mallrats

Start Left Behind from the main menu and walk its first two chapters: six Artefacts, twelve conversations and the brick contest.

Left Behind is a separate campaign, and its Artefacts, conversations and trophies all count toward 100%. The game lets you start it at any time, even before the main story, but this guide places it after the credits, so finish the story first and then start it from the main menu. It has six chapters, and this stretch covers the first two. A pickup you miss can be collected after Left Behind's own credits: its chapter list is separate from the main game's and sits under the Left Behind entry on the main menu. Highlight a chapter to see what it's short of, then select it to replay.

Start Left Behind from the main menuQuest stepDLC: Left Behind
Location
Left Behind · Back in a Flash – After the credits, go back to the main menu, choose Left Behind and start a playthrough on any difficulty. Let the opening scenes play until you can move.
Requires
Summary
Left Behind runs from its own menu entry, not from inside the story.
Sources
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Find Weston's PharmacyQuest stepDLC: Left Behind
Location
Left Behind · Back in a Flash – You start in the mall's main atrium. Go upstairs, follow the walkway round to the left, and duck under the debris into Weston's Pharmacy. Its back door is locked.
Requires
Summary
The first shop on the route, upstairs from the atrium.
Sources
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Artefact: Combination NoteCollectibleDLC: Left Behind
Location
Left Behind · Back in a Flash – Go behind the counter on the right as you come in. The note lies on the floor behind the register.
Requires
Summary
A note on the pharmacy floor, with the combination for the shop next door.
Sources
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Artefact: Pharmacy KeyCollectibleDLC: Left Behind
Location
Left Behind · Back in a Flash – Leave Weston's and go round the corner to American Princess next door, then open its shutter. Keep to the left wall as far as the back left corner and search the body. The key comes to you when you do.
Requires
Summary
The key to Weston's back door, on a body at the back of American Princess.
Sources
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Artefact: Pharmacist's NoteCollectibleDLC: Left Behind
Location
Left Behind · Back in a Flash – The note falls beside the same body once the key is taken. Pick it up off the floor before you leave the store.
Requires
Summary
It drops to the floor when you take the key.
Sources
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Unlock the pharmacy and cross Pixitek to the salonQuest stepDLC: Left Behind
Location
Left Behind · Back in a Flash – A Clicker walks past outside American Princess: wait until it moves away, then knife it from behind. Go back to Weston's, unlock the back door and jump through the window into Pixitek. Walk through to the fork, take the right path and crawl through the rubble into Rarity Nail Salon.
Requires
Summary
The key opens the way on, through Pixitek to Rarity Nail Salon.
Sources
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Artefact: Salon NoteCollectibleDLC: Left Behind
Location
Left Behind · Back in a Flash – Walk past the salon chairs to the soldier's body, before the collapsed vent that leads out. The note is on the floor right by the body.
Requires
Summary
A note by a soldier's body in Rarity Nail Salon.
Sources
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Before you vault the railing

Have all four Artefacts first: the Combination Note, Pharmacy Key, Pharmacist's Note and Salon Note. The railing ends the chapter.

Mallrats has twelve conversations, and most are short stops on a tight walk. At each one, take the prompt, then stand still until the talk has ended before you walk on.

Artefact: Wanted PosterHidden spoiler – activate to revealCollectibleDLC: Left BehindMinor spoiler
Location
Left Behind · Mallrats – When Mallrats starts, follow Riley up the stairs and crawl under the planks across the half-blocked door. She heads left, but go on into the main room: the poster is on the table in the middle.
Requires
Summary
A poster on a table, just off Riley's path.
Sources
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Before you go out on the rooftops

Have the Wanted Poster and the Firefly Logo talk first.

Reach the mallHidden spoiler – activate to revealQuest stepDLC: Left BehindMinor spoiler
Location
Left Behind · Mallrats – From the bedroom, follow Riley up to the roof, across the rooftops and back indoors, as far as the first escalator down into the mall.
Requires
Summary
The rooftops lead to the abandoned mall.
Sources
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Conversation: Hawaii PosterHidden spoiler – activate to revealOtherDLC: Left BehindMinor spoiler
Location
Left Behind · Mallrats – Walk down the escalator, but don't follow Riley. Turn back the way the escalator came, keeping it on your right, and go under the Parking Garage sign into the dead-end hallway. Take the prompt at the Kauai beach advert on the left wall and wait for the talk to finish.
Requires
Summary
A short talk at a beach advert in a dead-end hallway.
Sources
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Conversation: Typhoon Blitz AdvertHidden spoiler – activate to revealOtherDLC: Left BehindMinor spoiler
Location
Left Behind · Mallrats – Go back past the escalator and on down the mall, keeping left of the planters and benches in the middle. The water gun advert stands beside them, across from a clothing store. Take the prompt and wait for the talk to finish.
Requires
Summary
A short talk at a water gun advert.
Sources
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Before the second escalator

At the bottom, Riley stands by the tent for only a few seconds. Walk straight to her and talk.

Conversation: WinstonHidden spoiler – activate to revealOtherDLC: Left BehindMinor spoiler
Location
Left Behind · Mallrats – Follow Riley down the next escalator. She stops just left of the tent and brings up Winston: take the prompt before she moves on, then wait for the talk to finish. If you miss it, replay the chapter after Left Behind's credits.
Requires
Summary
A short talk with Riley at the foot of the second escalator.
Sources
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Conversation: Winston's TentHidden spoiler – activate to revealOtherDLC: Left BehindMinor spoiler
Location
Left Behind · Mallrats – Follow Riley into the tent and go to the back left corner by the cot. Use the magazines and papers on the blue shelf and wait for the talk to finish. It leads into a choice, and either answer is fine.
Requires
Summary
A talk over the papers at the back of the tent.
Sources
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Conversation: SaddleHidden spoiler – activate to revealOtherDLC: Left BehindMinor spoiler
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Boost Riley and put on the wolf maskHidden spoiler – activate to revealQuest stepDLC: Left BehindMinor spoiler
Location
Left Behind · Mallrats – Follow Riley to the rubble and hold the prompt to lift the metal pole with her. When it breaks, boost her up into the store on the right and wait for her to open the door. Inside, put on the wolf mask and tap the prompt fast until the bar fills, then wait for the talk to finish.
Requires
Summary
Rubble blocks the way, so the route cuts through a Halloween store.
Sources
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Conversation: Eyeball JarHidden spoiler – activate to revealOtherDLC: Left BehindMinor spoiler
Location
Left Behind · Mallrats – After the wolf mask, Riley heads for the store's back right corner. Follow her and use the jar of fake eyeballs on the shelf to her right. Wait for the talk to finish, then for her joke at the coffin behind you.
Requires
Summary
A short talk at a jar on a shelf.
Sources
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Conversation: Vampire MaskHidden spoiler – activate to revealOtherDLC: Left BehindMinor spoiler
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Conversation: Witch MaskHidden spoiler – activate to revealOtherDLC: Left BehindMinor spoiler
Location
Left Behind · Mallrats – From the back of the store, walk down the middle aisle. Halfway along on your right, by the kids' section, put on the green witch mask. Talk to Riley when she comes over and wait for the talk to finish.
Requires
Summary
A short talk in a green witch mask.
Sources
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Conversation: Triple Phoenix MaskHidden spoiler – activate to revealOtherDLC: Left BehindMinor spoiler
Location
Left Behind · Mallrats – Go to the aisle nearest the exit, on the left as you face the store from the entrance. Halfway down, put on the Triple Phoenix mask, a bird in a backward cap. Talk to Riley and wait for the talk to finish.
Requires
Summary
A short talk in a bird mask.
Sources
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Conversation: SkeleseerHidden spoiler – activate to revealOtherDLC: Left BehindMinor spoiler
Location
Left Behind · Mallrats – Go to the end of the aisle, into the corner left of the entrance. Use the skull toy over and over, eight times in all, until the prompt is gone. Riley then comes over and takes her turn: step back a little if she doesn't. Take any prompt that shows and stay until she ends on her line about Poker.
Requires
Summary
A skull toy that answers questions, until Riley takes a turn.
Sources
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Before you leave the Halloween store

Finish all five talks first: Eyeball Jar, Vampire Mask, Witch Mask, Triple Phoenix Mask and Skeleseer. Then make a manual save, because the brick contest starts just past the double doors.

Brick MasterHidden spoiler – activate to revealAchievementDLC: Left BehindMinor spoiler
Location
Left Behind · Mallrats – Go through the double doors on to the balcony. Yours is the red car: break all seven of its windows before Riley breaks all seven on the blue one. Grab any brick lying around, hold your aim until the green triangle shows, then throw, because a miss costs more than a careful aim. Do the near side and sunroof, then the front, then run round the balcony for the far side. If Riley says she's on her last window, restart from the last checkpoint or load your save and try again, or, after Left Behind's credits, replay the chapter.
Requires
Summary
Win the brick throwing contest against Riley.
Trophies
  • Achievement · SteamBrick Master
  • Bronze · PlayStationBrick Master
Sources
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Conversation: Question for RileyHidden spoiler – activate to revealOtherDLC: Left BehindMinor spoiler
Location
Left Behind · Mallrats – After the win, a prompt offers three questions and Forget it. Pick a question, not Forget it, and wait for her answer to finish. If Mallrats shows short after Left Behind's credits, replay it and ask a different one.
Requires
Summary
The contest's prize: a question for Riley, offered only if you win.
Sources
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Artefact: Warning NoteHidden spoiler – activate to revealCollectibleDLC: Left BehindMinor spoiler
Location
Left Behind · Mallrats – Follow Riley down the stairs to the basement corridor. The kitchen-like room is through the first door on the left. Look on the bench beside the coffee makers, behind the island. Riley calls from the hall, but she can wait.
Requires
Summary
A note in a kitchen-like room off the basement corridor.
Sources
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Before the double doors

Have the Warning Note first. Opening these doors ends the chapter.

Flip the breaker and go through the double doorsHidden spoiler – activate to revealQuest stepDLC: Left BehindMinor spoiler
Location
Left Behind · Mallrats – Go back to Riley in the corridor and flip the circuit breaker when she's ready. Then wait at the double doors for her to open them, and the chapter ends.
Requires
Summary
A circuit breaker and a pair of doors end Mallrats.
Sources
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About this guide

One run of the story and one of Left Behind, on any difficulty: no trophy depends on it. The story is one way, so take each pickup before you move on. After the credits, Chapter Select clears anything its menu shows as short, but take the Workbench Tools on the first run: the menu doesn't show them, and one taken on a replay may not count.

Last verified: Nov 7, 2026 · Patch Latest patch (PS5, PC on Steam and Epic), with Left Behind · 0 community corrections shipped

Unofficial fan guide. Not affiliated with the publisher.